<div class="col-sm-3">
    <nav class="navbar navbar-light bg-light">
        <input class="form-control " type="search" placeholder="Search" aria-label="Search">
    </nav>



            <div id="accordion">
                <div class="card">
                    <div class="card-header" id="headingOne">
                        <h5 class="mb-0">
                            <button class="btn btn-link" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
                                栏目分类
                            </button>
                        </h5>
                    </div>

                    <div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordion">
                        <div class="card-body">
                            <nav class="navbar navbar-light bg-light">
                                <a class="navbar-brand" href="#">栏目列表</a>
                            </nav>
                            <nav class="navbar navbar-light bg-light">
                                <a class="navbar-brand" href="#">添加栏目</a>
                            </nav>
                        </div>
                    </div>
                </div>
                <div class="card">
                    <div class="card-header" id="headingThree">
                        <h5 class="mb-0">
                            <button class="btn btn-link collapsed" data-toggle="collapse" data-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
                               文章管理
                            </button>
                        </h5>
                    </div>
                    <div id="collapseThree" class="collapse" aria-labelledby="headingThree" data-parent="#accordion">
                        <div class="card-body">
                            <nav class="navbar navbar-light bg-light">
                                <a class="navbar-brand" href="#">文章列表</a>
                            </nav>
                            <nav class="navbar navbar-light bg-light">
                                <a class="navbar-brand" href="#">文章栏目</a>
                            </nav>
                        </div>
                    </div>
                </div>
            </div>


</div>